I have just returned from DL and had to store my luggage on our first day so I know the lockers very well. The prices are six and eight dollars and they take credit card or cash. I am not too sure about the smaller ones but the larg ones fit 2 large carry on bags and had a bit of room left over,they are probably close to 3 feet deep and maybe 18 by 24 inches. I was suprised at how big they were. You can have access tothem all day, in and out as often as you want.
hope that helps,
Christine